Headset



FIG. 1 is a perspective view of a headset.

FIG. 2 is a side view thereof.

FIG. 3 is a top view thereof.

FIG. 4 is a front view thereof.

FIG. 5 is a back view thereof.

FIG. 6 is the other side view thereof; and,

FIG. 7 is the bottom view thereof.

The broken lines form no part of the claimed design. 

The ornamental design for a headset, as shown and described. 